मंगलग्रह

नेपाली विकिपीडियाबाट
यसमा जानुहोस्: परिचालन, खोज्नुहोस्
यो लेख वा खण्ड नेपाली भाषामा नभएर अर्को भाषामा लेखिएको छ।
यदि यो लेखमा तपाईंको योगदान छ भने यसलाई नेपाली भाषामा उल्था गर्नुहोला।
एक महिनासम्म उल्थानभएमा यसलाई हटाएर नयाँ लेख बनाइने छ ।
Mars  Astronomical symbol of Mars
The planet Mars
Mars in 1980 as seen by the Viking 1 Orbiter
Designations
Pronunciation Listeni/ˈmɑrz/
Adjective Martian
Epoch J2000
Aphelion 249,209,300 km
1.665 861 AU
Perihelion 206,669,000 km
1.381 497 AU
Semi-major axis 227,939,100 km
1.523 679 AU
Eccentricity 0.093 315
परिभ्रमण अवधि 686.971 days

1.8808 Julian years

668.5991 sols
परिभ्रमण अवधि 779.96 days
2.135 Julian years
परिभ्रमण गति 24.077 km/s
Mean anomaly 19.3564°
Inclination 1.850° to ecliptic
5.65° to Sun's equator
1.67° to invariable plane[२]
Longitude of ascending node 49.562°
Argument of perihelion 286.537°
उपग्रह 2
Physical characteristics
भूमध्यरेखीय अर्धब्यास 3,396.2 ± 0.1 km[a][३]
0.533 Earths
ध्रुवीय अर्धब्यास 3,376.2 ± 0.1 km[a][३]
0.531 Earths
Flattening 0.005 89 ± 0.000 15
सतहको क्षेत्रफल 144,798,500 km2
0.284 Earths
आयतन 1.6318×10११ km3[४]
0.151 Earths
पिण्ड 6.4185×10२३ kg[४]
0.107 Earths
औशत घनत्व 3.9335 ± 0.0004[४] g/cm³
Equatorial surface gravity 3.711 m/s²[४]
0.376 g
Escape velocity 5.027 km/s
परिक्रमण अवधि 1.025 957 day
24.622 9 h[४]
Equatorial rotation velocity ८६८.२२ km/h (२४१.१७ m/s)
अक्षको झुकाव 25.19°
North pole right ascension 21 h 10 min 44 s
317.681 43°
North pole declination 52.886 50°
Albedo 0.170 (geometric)[५]
0.25 (Bond)[६]
Surface temp.
   Kelvin
   Celsius
min mean max
186 K 210 K[६] 293 K[८]
−87 °C −63 °C 20 °C
Apparent magnitude +1.6 to −3.0[७]
Angular diameter 3.5–25.1"[६]
Atmosphere[६][९]
वायुमण्डलीय चाप 0.636 (0.4–0.87) kPa
वायुमण्डलीय तत्वहरू (mole fractions)

95.32% carbon dioxide
2.7% nitrogen
1.6% argon
0.13% oxygen
0.08% carbon monoxide
210 ppm water vapor
100 ppm nitric oxide
15 ppm molecular hydrogen[१०]
2.5 ppm Neon
850 ppb HDO
300 ppb Krypton
130 ppb formaldehyde
80 ppb xenon
30 ppb ozone[स्रोत नखुलेको]
18 ppb hydrogen peroxide[११]

10 ppb methane[१२]
मंगलको उत्तरी र दक्षिणी ध्रुवमा बरफ देखिन्छ।

सौर्यमण्डलमा मंगलग्रह सूर्यबाट चौथो ग्रह हो।

रातो ग्रह भएकोले र रगतको रङ्ग रातो भएर, युरोपेलीहरूले मंगलग्रहलाई रोमाली युद्धदेवको नाम मार्स दिए।

मंगलग्रहको दुइटा एकदम साना चन्द्रमा छन्। त्यसका नाम फोबसडाइमस हुन्।

मंगलग्रह ढुङ्गाबाट बनेको हो। ढुङ्गा र धुलोमा फलामको खैयो पाइएकोले, जमीन रातो देखिन्छ। ग्रहको कार्बन डाइयक्साइडबाट बनेको वायु-मण्डल बिरल छ। सूर्याबाट टाढा भएकोले, मंगलग्रहको तापक्रम पृथ्वीको भन्दा धेरै जाँडो हुन्छ। मंगलको उत्तर र दक्षिण ध्रुवमा पानीको बरफ र कार्बन डायोक्साइडको बरफ पनि पाइन्छ।

आजभोली ध्रुवमा बाहेक मंगलको सतहमा पानी पाइँदैन। धेरै वैज्ञानिकको विचारमा पानी पहिले पहिले पाइन्थ्यो। कति पानी पाइन्थ्यो, पानी कहिले बिलायो भनेर वैज्ञानिक पत्ता लगाउन खोज्दैन्। जमीनको मुनी पानी अझै भएको विश्वास कुनै वैज्ञानिकहरू गर्छन्।

Because Mars is closest to the Earth in the Solar System, people have wondered if there was any kind of life on Mars.

Some famous stories were written about this idea. The writers used the name "Martians" for intelligent beings from Mars. In 1898 H. G. Wells wrote The War of the Worlds, a famous novel about Martians attacking the Earth. In 1938, Orson Welles broadcast a radio version of this story in the United States, र many people thought it was really happening र were very afraid. Beginning in 1912, Edgar Rice Burroughs wrote several novels about adventures on Mars.

As of November 2006, scientists still have not discovered proof of any life on Mars, either living now or extinct.

Several space probes without people have gone to Mars to study it. Some have orbited (gone around) the planet, र some have landed on it. We have pictures of the surface of Mars that were sent back to Earth by some of these probes.

Some people are interested in sending astronauts to visit Mars. This would be a difficult project, र the astronauts would have to stay away from Earth for several years.

सन्दर्भ[सम्पादन गर्ने]

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See also[सम्पादन गर्ने]